The barrels are also stress relived and the forcing cone is not of a straight angle but has a rolled taper. The lands are .355 and bore .358. The revolver was designed to be able to shoot 9.. like my MR 73 Convertible which has a 9mm cylinder. There are two flat springs in the grip that are both adjustable. One is for hammer force and the other for trigger force. I have less than a 4 pound double action trigger an 1.25 pound single action pull. The trigger group has 3 rollers thus making one of the smoothest triggers out there. The MR 73 Match and Silhouette models had a Swiss made match rear sight with interchangeable blades. From personal experience, every match rear sight had the same clicks for a given distance. BTW, the MR73 was the first CNC manufactured revolver. All parts are interchangeable except the removable right side plate. The GIGN used a 9.5 inch version with a pistol scope as a sniper firearm successfully during a hijacking in France. The MR73 is still used by some of the Gendarmerie National.